striped my blown 1275 down, it has a 12g1505a crank.

is this a large journal ?

cheers
jayson

12G1505, 1275cc, Non-S, EN16T with 1.75" dia. big ends.

http://www.calverst.com/articles/Eng-Cr ... tionID.htm

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http://www.youtube.com/user/Hanras

^^^^ that means yes

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

thanks guys

Crack test before you grind it, cracking is common in these.
Of 6 big J cranks that St George Cranks got in to grind a while ago, 4 were cracked already.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Make sure that it has not been offset ground to make a stroker. Check which rods it was used with !!! Might be a stroker !!!

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

thanks doc,what do they do to crack test them ?

convertible mini,how do i now if it`s been strocked ? is standard bore if that helps.

cheers
jayson

Dye penetrant crack testing, either a two stage (red dye then white powdery paint) Dye penetrates the crack, then bleeds back to show through white second coat.

http://www.twi.co.uk/content/ksijm001.html

http://en.wikipedia.org/wiki/Dye_penetrant_inspection

Or fluorscent dye penetrant, spray the crank, then look at it under fluorscent light to see where dye has penetrated crack.

http://www.marinediesels.info/repairs/c ... ection.htm

Both these techniques (I think) can be aided by magnetising the test piece to concentrate the dye into the crack.

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Sir Alec! we are not worthy!

Measure the diameter of the bigends. I'm not sure of the numbers off the top of my head but you can grind these down to accept the 'S' conrods, and if you offset grind these you can either increase or decrease the stroke of the engine. I think it's covered in Vizard's Tuning The A-Series Engine (the yellow book).

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

ahh ok,thanks guys. i have vizards book will look into it.

cheers
jayson